Resolve bounded old actor event references

[dajiaohuang]

Problem

Actor-centric memory projections only had recent-window and query search reads. With an empty query, a durable current_refs entry pointing to an authorized event older than the first 200 records could not be recalled, even though its stable ID was known. Reading tables directly in a domain MCP would duplicate branch, participant, ActorKnowledge-source, disclosure, and audience authority.

Solution

Add EventService.list_for_actor_event_ids, a bounded exact-reference read for 1..128 event IDs. It reuses the existing actor event authority filters, branch-visible event set, player audience projection, and participant materialization. Document the method as the supported path for durable event refs.

Verification

• full Core pytest suite passed (348 tests collected, 2 expected skips)
• focused regression proves a participant event older than the 200-event recent window is recalled
• focused regression proves an ActorKnowledge source event is recalled only with permitted disclosure and an unrelated actor receives no event
• empty and >128 request boundaries are rejected
• ruff check src tests
• git diff origin/main...HEAD --check

Compatibility

The new method is additive. Existing recent and search reads are unchanged; callers opt in only when they already hold stable event IDs.